Thomas eadfoed



(No Modei.)

T. RADFORD.

ROCK DRILL.

No. 27,977. Patented Feb.2'7, 1883.

INYE NTORL W z; Q%/%% I ATTORNEY UNITED STATES ATENT FFICE.

THOMAS BADFORD, OF BLOOMINGTON, ILLINOIS, ASSIGNOR OF FOUR-FIFTHS TOJAMES B. STEVENSON, WILLIAM STEVENSON, MATTHEW T. SCOTT, AND WILLIAMRADFORD, ALL OF SAME PLACE.

ROCK-DRILL.

SPECIFICATION forming part of Letters Patent No. 272,977, dated February27, 1883.

Application filed October 9,1882. (No model.)

To all whom it may concern.- 7

Be it known that I, THOMAS RADFORD, of the city of Bloomington, in thecounty of Mc Lean, and in the State of Illinois, have invented certainnew and useful Improvements in Miter-Gear and Ratchet-Drills forDrilling Rock and Coal; and I do hereby declare that the following is afull, clear, and exact description thereof, reference being bad to theaccom- [O panying drawings, and to the letters of reference markedthereon, making a part of this specification, in which Figure 1represents a side elevation of my improved rockand coal drillingmachine; Fig.

2, a front view of the same; Fig. 3, side and back views ofratchet-lever.

The object of my invention is to increase the efficiency and operationof machines employed for drilling rock, coal, 8m; and it consists innovel features of construction, combination,

and arrangement of parts, all as will be hereinafter fully described,and set forth in the claims hereto annexed.

In the annexed drawings, A represents a 2 metallic tube or pipe, havingat one end a tapering steel point, a, to be applied to a post or othersuitable abutment when operating the drill, and at its other end with aninterior screw-thread for the reception of the 0 screw-rod G, which isprovided at its lower end with a square socket, H, for the reception ofthe square shank of the drill K.

B represents a metallic tubular frame, detachably secured in anysuitable manner over or to the lower end of the tube or pipe A, andprovided on opposite sides with stub-axles b 1), upon which are looselymounted the bevel or miter gear wheels F F, which mesh with a bevel ormiter gear wheel, F, arranged in the guard D of the frame B for keepingit in place. and mounted on and keyed to the screw-rod O by a keydovetailed in the hub of said wheel, and which fits in the groove 0,running the entire length of the screw-rod.

5 N represents metallic projections on the outer sides of thegear-wheels F F, having openings through them for the reception of thehandles E E, which can be adjusted therein to lengthen or shortentheni,and secured in any desired position by the set-screws P for increasingor decreasing the leverage of the handles.

By the above arrangement one or two persons can be employed foroperating the drill, the wheels F being turned by the handles E, andthus communicating a revolving motion to the wheel F and the screw-rodto which the wheel F is keyed.

Upon the lower end of the screw-rod G is securely mounted aratchet-wheel, G, which is operated by a detachable hand-lever, R,having hooked bars 1" r, connected to the opposite sides of the lever,and an intermediate pivoted pawl,

S, and spring S. In operating the ratchetwheel by said lever B thehooked ends r r are placed over the socketed end of the screw-rod G andon opposite sides of the ratchet-wheel, (to form a firm and steadyfulcrum for said lever,)

so that the pawl S will engage the teeth thereof when it is operated ina similar manner to .70 all ratchet-drills.

When the ratchet mechanism is used for operating the drill the gearingmechanism maybe removed by merely removing the screw-rod C and slippingthe frame oil from the tube or pipe A, and then replacing the screw-rod.

The ratchet mechanism, although working slower than the gearingmechanism, can be used where it is desired to run straight along theside ot'and within one inch ot'a wall, which makes it very advantageousfor drilling headings, where the gearing mechanism could not be used.

In drilling perpendicular holes great diffn culty and trouble areexperienced in removing the dirt and borings; and to obviate this defeetI employed an open-ended detachable tube orjacket, J, which fits overthe drill, as shown in Figs. 1 and 2. The bit or point of thedrill ismade large enough, or the tube or jacket J 0 made smaller in diameterthan the enlarged end of the drill-bit or point, to prevent the tube orjacket from coming oft, and to cut away the ground or other material tomake room for it, and when the same is full the drill is removed fromthe screw-rod and the tube or jacket taken off over the shank end ofdrill and the dirt or borin gs removed therefrom, when it is againplaced on the drill and the drill replaced in the screw-rod.

The drill is made in the usual spiral or twisted shape, so as to causethe borings to move out of the hole being drilled, with the bit or pointof diamond shape and the edges of the drill turned sli htly forward, sothat it cuts very easily.

L represents a small bar of steel, adapted to a hole in the tube or pipeA, as shown in Fig. 2, to prevent it from turning when making the drill.

Further description of the operation of my improved drill is deemedunnecessary, it being obvious from the foregoing.

Having thus fully described my invention, whatl claim as new, and desireto secure by Letters Patent, is-

l. The combination, with the tube or pipe A and screw-rod (J, carryingthe drill, of the detachable tubular frame B, provided with stub mile oraxles b, gear wheel or wheels F,

mounted thereon, guard D, and gear-wheel F, keyed to the screw-rod, theseveral parts arranged relatively to each other and adapted 2 to beoperated substantially in the manner herein shown and described.

2. The combination, with the screw-rod, of the removable drill, havingan enlarged bit or point, and the detachable or removable 3o open-endedtube orjacketofless diameter than the enlarged end of the bit or point,substantia-lly as and for the purpose herein shown and described.

In testimony that I claim the foregoing I 5 have hereunto set my handthis 3d day of October, 1882.

r V 7 his THOMAS RADFORD.

mark. Witnesses :v

Tnos. SLADE. E. M. HAMILTON.

